Another sweet boat this weekend (see yesterday's Zipper Motorboat), the Seabreacher X is a high-speed sub, fashioned after a man-eating shark. Built by Innespace, the submarine has a 260 horsepower engine, can speed through the water at 50 mph on the surface and 25 mph when diving, and best of all: the Seabreacher X can jump 12 feet into the air!

Amateur Chinese inventor, Tao Xiangli, has built his own homemade submarine. Drawing inspiration from the James Bond and Terminator movies, Xiangli's tinkering is quite impressive, considering his education came to a halt at the fifth grade.